Did UFOs cause Marilyn Monroe's death? Documentary claims proof

A new documentary claims that Marilyn Monroe was killed because she was going to leak evidence regarding extraterrestrials and their existence.

Directed by Michael Mazzola, "Unacknowledged" goes into a wide range of conspiracy theories, including one that offers up a possible explanation for Marilyn Monroe's death -- that she knew about UFOs and threatened to leak classified documents.

In a clip first spotted by technology website Gizmodo, actor Burl Ives claimed that Monroe did not die from a drug overdose. Dr. Steven Greer, who is the subject of the documentary holds up a so-called death warrant after Monroe had had phone coversations with reporter Dorothy Kilgallen, who was looking into the famous Roswell incident.

Below is the clip in its entirety:

According to a plot summary on movie database website, IMDB, "Unacknowledged" is about the so-called Disclosure Project and how UFO secrecy has been enforced.

"The best evidence for extraterrestrial contact, dating back decades, is presented with direct top-secret witness testimony, documents and UFO footage, 80% of which has never been revealed anywhere else," the plot summary reads. "The behind-the-scenes research and high-level meetings convened by Dr. Steven Greer will expose the degree of illegal, covert operations at the core of UFO secrecy."